Cosmic Overlay Studies in ProtoDUNE-SP · A question of TrackIds • Started off looking at...
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Cosmic Overlay Studies in ProtoDUNE-SP Leigh Whitehead 31/10/16
Transcript of Cosmic Overlay Studies in ProtoDUNE-SP · A question of TrackIds • Started off looking at...
CosmicOverlayStudiesinProtoDUNE-SP
LeighWhitehead
31/10/16
Introduction• IamanewCERNfellowworkinginthenewneutrinogroup
• Amongstotherthings,Iwanttoknowhowthecosmicraysaregoingtoaffectthereconstruction• Numerousoverlappingtracks• Associationofdelta-rays• MuonBremsstrahlung(orotherphotons?)• etc…
• I’vejustbeenlookingattruthinformationsofartofindmyfeetinthesoftwareframework
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AquestionofTrackIds• StartedofflookingatElizabeth’scosmicrayoverlayfiles
• Seriesofcosmics overlaidon1GeVbeammuons
• Thebeamparticlescanbeselectedusingorigin==4• Theprimarycanthenbeobtainedbyaskingprimary_process==1
• The“Mother”IDforthe(origin==4)particlessuggeststhattheprimarybeamparticleshouldhaveTrackID==1• Thisistrueforjustasingleparticleinteractionwithoutoverlays
• However,allcosmicparticlesareinsertedatlowerTrackIds thanthebeamparticles• BeamprimaryendsupwithaTrackId around400000orso• The“Mother”fieldforthebeamparticlesdoesn’tseemtobeupdatedto
matchthis
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LookingattheCosmics• Inanycase,theTrackId issuedoesn’taffectthecosmics,soI
startedtolookatthese.
• Bydefault,thetrueparticlesthatstartsmallEMshowersarenotstored• Dorota reprocessedafilesuchthatIwouldhaveaccesstothisinformation
• Currentrecipe:• Findallprimarycosmicmuon(andanti-muon)tracks
• Findalloftheelectronsandphotonswhoaredaughtersof thesemuons.• Onlyconsiderthosedaughtersnotoriginating fromthemuonendpoint.• Thisshouldgiveusthedelta-raysandphotons.
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DeltaRays
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DeltaRays
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Looksliketwopopulations here?
Looksmostlylinearasafunctionofmuon tracklength, solikelyageometryeffect.
Bremsstrahlung?
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Firstlookatreconstruction• Firststepistohavealookatsomeeventstoseehowthingsare
working.
• Nextfewslidesshowsometrueandreconstructedviewsofasinglebeammuoneventwithanumberofoverlaidcosmics.
• Beaminteractionsentertheactivevolumeatroughly(90cm,356cm)in(x,y).• Iwillhighlightthestartandendpointsinboth.
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Event1:True
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Event1:Reconstructed
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Lookstobereconstructedcorrectlyasasingletrack.
Event2:True
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Event2:Reconstructed
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Trackseemstohavebeensplitintothreesegments:firstlyatanoverlap,thenasitcrossesTPCs.
Event3:True
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Event3:Reconstructed
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Lookstobereconstructedcorrectlyasasingletrack.
Summary• Startedtolookintotheeffectofcosmicsonthebeamparticle
reconstruction.• Simpletruthleveldistributionssofar.
• Willmoveontolookingattheoutputsofthereconstructionandtrytomatchuptheclusterswiththedeltaraysandphotons.• Havestartedhandscanningafeweventsintheeventdisplay.
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